Default [Q] Dock is connected, Headphones disconnected popup messages

Hi
I acknowledge that I have read 6 related "dock is connected" forum threads but did not find answer to the problem below.

My (never messed with) Note 3's screen goes blank sometimes and then gives "Dock is connected, headphones disconnected" messages when I'm just holding it in my hand and there is no dock nearby and I'm not connecting it anywhere. See attached image.


Wireless Wave asked me to hard reset to factory settings which did not help.
I'm still under 1 year Samsung warranty.

Is there something wrong with the USB dock hardware?
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